\[Страница\ 23.\]
\[\boxed{\mathbf{65.}}\]
\[Верные\ числовые\ равенства:\]
\[\textbf{а)}\ 15 - 7 = 8\]
\[\textbf{в)}\ 189 + 354 = 543\]
\[\boxed{\mathbf{66.}}\]
\[\textbf{а)}\ 4\]
\[\textbf{б)}\ 5\]
\[\textbf{в)}\ нет\ такого\ числа\]
\[\boxed{\mathbf{67.}}\]
\[\textbf{а)}\ y - 77 = 151\]
\[y = 151 + 77\]
\[y = 228.\]
\[\textbf{б)}\ 222 - y = 143\]
\[y = 222 - 143\]
\[y = 79.\]
\[\textbf{в)}\ (y + 7) - 11 = 16\]
\[y + 7 = 16 + 11\]
\[y + 7 = 27\]
\[y = 27 - 7\]
\[y = 20.\]
\[\boxed{\mathbf{68.}}\]
\[\textbf{а)}\ \ z + 37 = 56\]
\[z = 56 - 37\]
\[z = 19.\]
\[\textbf{б)}\ 147 + z = 162\]
\[z = 162 - 147\]
\[z = 15.\]
\[\textbf{в)}\ z - 283 = 32\]
\[z = 32 + 283\]
\[z = 315.\]
\[\textbf{г)}\ 746 - z = 97\]
\[z = 746 - 97\]
\[z = 649.\]
\[\boxed{\mathbf{69.}}\]
\[\textbf{а)}\ x + 5 + 4 = 12\]
\[x + 9 = 12\]
\[x = 12 - 9\]
\[x = 3\ (пирожка) - съела\ Ника.\]
\[Ответ:3\ пирожка.\]
\[\textbf{б)}\ В\ вазе\ стало\ (35 - x)\ роз.\ \]
\[После\ того,\ как\ добавили\ 11\ \ \]
\[бордовых\ роз,в\ вазе\ стало\ \]
\[39\ роз.\ \]
\[Составим\ уравнение:\]
\[35 - x + 11 = 39\]
\[46 - x = 39\]
\[x = 46 - 39\]
\[x = 7\ (белых\ роз) - забрали\ \]
\[из\ вазы.\]
\[Ответ:7\ белых\ роз.\]